Select the Right Jalapeños: For cowboy candy, you'll need fresh jalapeños. Choose peppers that are firm and have a bright green color. Avoid those with any soft spots or signs of rotting.
Slice the Jalapeños: After washing and drying the jalapeños, remove the stems and slice them into rings, about 1/4 inch thick.
Combine Ingredients: In a large pot, combine the cider vinegar, sugar, turmeric, mustard seed, cayenne, ginger, salt and minced garlic. Bring the mixture to a boil and stir until the sugar has dissolved.
Add Jalapeños: Once the mixture has boiled, add the sliced jalapeños and let them simmer for 4-5 minutes until they turn dark and glossy. Stir occasionally.
Jar the Candy: Use a slotted spoon to remove the jalapeños from the pot and pack them into sterilized jars. Be sure to leave at least 1/4 inch of headspace at the top of each jar.
Preserve the Candy: Pour the remaining liquid mixture over the jalapeños, making sure to cover them completely. Use a knife or chopstick to remove any air bubbles, wipe the rims, and seal the jars with lids and bands.
Process the candy: Process half/quarter pint jars in a boiling water bath canner for 15 minutes.
Store: Let the jars cool completely and store them in a cool dry location. Store any unsealed jars in the refrigerator. The cowboy candy will last for several years on the shelf and several weeks in the refrigerator, but it's unlikely to last that long as it's so delicious!